JP2014129671A - Beam reinforcement, method of manufacturing beam reinforcement unit, and joining structure of beam reinforcement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam of reinforced concrete construction, which increases construction efficiency.SOLUTION: A downside beam reinforcement unit 550L is dropped in without consideration of interference between beam reinforcements of a column-beam joint. Subsequently, an upside beam reinforcement unit 550U is dropped in.

Description

  The present invention relates to a beam reinforcing bar, a method for manufacturing a beam reinforcing bar unit, and a bonded structure of beam reinforcing bars.

  Patent Document 1 discloses a reinforced concrete beam in which shear reinforcement bars are arranged at predetermined intervals around the entire length of the beam main bars (see Patent Document 1).

  Patent Document 2 describes an assembling method for reinforcing bars of reinforced concrete beams in which reinforcing bars of orthogonal beams of reinforced concrete are attached to column portions. In this assembling method, a U-shaped stirrup is attached to the beam bottom main bar of the beam reinforcing bar, and both ends of the beam lower bar main bar are formed in an L shape that is bent downward, and the L-shaped end portion is interposed between the columns. Cross over and assemble the beam bottom main bar into a pillar. Next, a stirrup is attached to the beam main reinforcement of the orthogonal beam orthogonal to the beam lower end main reinforcement at the column portion, and both ends thereof are formed in an L shape, and the orthogonal beam is formed on the beam lower main reinforcement. Place on top. Further, an inverted U-shaped stirrup is attached to the beam upper main bar of the beam reinforcing bar, and the beam upper main bar is suspended between columns and fixed to the beam main bar of the orthogonal beam.

  However, it is desired to improve the construction efficiency of reinforced concrete beams.

JP 2011-122317 A JP 05-118141 A

  An object of the present invention is to improve the construction efficiency of reinforced concrete beams in view of the above facts.

  According to the first aspect of the present invention, the upper beam main bars arranged at intervals in the beam width direction and the U-shaped shear reinforcement bars arranged at intervals in the beam length direction are joined and integrated. The upper beam reinforcing bar unit, the lower beam main bars arranged at intervals in the beam width direction, and the U-shaped shear reinforcement bars arranged at intervals in the beam length direction are joined and integrated. The upper beam reinforcing bar unit and the lower beam reinforcing bar unit are arranged across the columns, and the upper and lower shear reinforcing bars are connected to each other.

  In the invention according to claim 1, the upper beam reinforcing bar unit can be dropped after dropping the lower beam reinforcing bar unit without dropping the lower beam reinforcing bar unit without considering the interference between the beam reinforcing bars in the column beam joint. It becomes. Therefore, the construction efficiency of reinforced concrete beams is improved.

  The invention according to claim 2 is a first step of arranging beam main bars and shear reinforcement bars in a lattice pattern, welding the beam main bars and the shear reinforcement bars, and using the beam main bars on the outside as fulcrums, A second step of bending the shear reinforcing bar into a U-shape.

  In the invention described in claim 2, the shear reinforcement bars are bent into a U-shape with the beam main bars arranged on both sides as fulcrums. Therefore, compared with the case where the shear reinforcement is bent using a separate jig, the manufacturing efficiency of the beam reinforcing bar unit is improved, thereby improving the construction efficiency of the reinforced concrete beam.

  Then, by joining the U-shaped shear reinforcing bar and the beam main bar in advance to form a beam reinforcing bar unit, it is not necessary to fix the unit with a binding wire, a number wire, or the like, thereby improving workability and transportability. Moreover, quality is stabilized by unitization, As a result, the man-hour at the time of construction is reduced.

  The invention of claim 3 has a lower beam reinforcing bar unit and an upper beam reinforcing bar unit manufactured by the manufacturing method according to claim 2, and the upper beam reinforcing bar unit is arranged above the lower beam reinforcing bar unit. The upper and lower shear reinforcement bars are connected to each other.

  In the invention according to claim 3, the upper beam reinforcing bar unit can be dropped after the lower beam reinforcing bar unit is dropped without considering the interference between the reinforcing bars, thereby facilitating the bar arrangement work. Therefore, the construction efficiency of reinforced concrete beams is improved.

  In the invention of claim 4, the lower beam main reinforcement arranged at intervals in the beam width direction and the U-shaped shear reinforcement arranged at intervals in the beam length direction are joined and integrated. The lower beam reinforcing bar unit, the upper beam main bars arranged at intervals in the beam width direction, and the U-shaped shear reinforcement bars arranged at intervals in the beam length direction are joined and integrated. The upper beam reinforcing bar unit, the lower frame member to which the shaft end of the lower beam main bar of the lower beam unit is joined, and the upper frame member to which the shaft end of the upper beam main bar of the upper beam reinforcing unit is joined. And a rebar fixing device having a connecting member that connects the lower frame member and the upper frame member with an interval in the vertical direction.

  In the invention according to claim 4, the shaft end portion of the lower beam main bar is coupled to the lower frame member of the reinforcing bar fixing device, and the shaft end portion of the upper beam main bar is coupled to the upper frame member of the reinforcing bar fixing device. Accordingly, the beam main bars are prevented from coming out. Moreover, since it is not necessary to consider the interference between reinforcing bars, the bar arrangement work becomes easy. Therefore, the construction efficiency of reinforced concrete beams is improved.

  According to a fifth aspect of the present invention, the lower frame member and the upper frame member of the reinforcing bar fixing device are each composed of a plurality of plate frame members that are overlapped and joined to each other, and the lower beam A recess is formed in which the shaft end of the main bar or the shaft end of the upper beam main bar is engaged.

  In the invention according to claim 5, the axial ends of the lower beam main bars and the upper beam main bars are engaged with the concave portions of the plate frame member, and are joined by being sandwiched between the plate frame members, thereby arranging the beam main bars. The muscle work is completed. Therefore, the workability is improved.

  According to the present invention, the construction efficiency of a reinforced concrete beam is improved.

It is a perspective view which shows the reinforcement of the joint part of 1st embodiment. (A) is a perspective view showing an upper beam reinforcing bar unit and a lower beam reinforcing bar unit, (B) is a perspective view showing a joint part reinforcing bar unit, (C) is a perspective view showing a column reinforcing bar unit. It is. It is a perspective view which shows the beam reinforcement arranged by the upper beam reinforcement unit and the lower beam reinforcement unit. It is a perspective view which shows a reinforcing bar fixing apparatus. FIG. 5 is an exploded perspective view of the reinforcing bar fixing device of FIG. 4. (A) is a perspective view which shows the joint part reinforcing bar unit which comprises a reinforcing bar fixing apparatus, (B) is the elements on larger scale of the B section of (A). It is a perspective view which shows (A) and (B) of the construction process of the joint part of 1st embodiment. It is a perspective view which shows (C) and (D) of the construction process of the joint part of 1st embodiment. (A) is a disassembled perspective view which shows the reinforcing bar fixing apparatus of a 1st modification, (B) is a front view which shows the principal part of (A). (A) is a perspective view which shows the reinforcing bar fixing apparatus of a 2nd modification, (B) is a perspective view which shows the principal part of (A). It is a disassembled perspective view which shows the reinforcing bar fixing apparatus of a 3rd modification. It is a perspective view which shows the reinforcing bar fixing apparatus of a 4th modification. (A) is a perspective view which shows the joint part reinforcing bar unit of the reinforcing bar fixing apparatus of a 5th modification, (B) is the elements on larger scale of the B section of (A). (A) is a perspective view which shows the joint part reinforcing bar unit of the reinforcing bar fixing apparatus of a 6th modification, (B) is the elements on larger scale of the B section of (A). It is a perspective view which shows (A) and (B) of the construction process of the foundation part of 2nd embodiment. It is a perspective view which shows (C) and (D) of the construction process of the foundation part of 2nd embodiment. It is a perspective view which shows (E) and (F) of the construction process of the foundation part of 2nd embodiment. It is a perspective view which shows (G) and (H) of the construction process of the foundation part of 2nd embodiment. It is a top view which shows the reinforcement of the base part of 2nd embodiment. It is a perspective view which shows the beam reinforcement of 3rd embodiment. It is a perspective view which shows the beam reinforcement of 3rd embodiment. It is a perspective view which shows the whole beam reinforcement shown in FIG. It is process drawing which shows the manufacturing process of a beam reinforcement unit, The perspective view of (A) and the front view seen in the longitudinal direction of (C) show the state before bending a shear reinforcement, The perspective view of (B), The front view seen in the longitudinal direction of (D) shows the state after bending the shear reinforcement. It is a perspective view which shows (A) and (B) of the construction process of the reinforced concrete column and reinforced concrete beam in 3rd embodiment. It is a perspective view which shows (C) and (D) of the construction process of a reinforced concrete column and a reinforced concrete beam in a third embodiment. It is a perspective view which shows (E) and (F) of the construction process of the reinforced concrete pillar and the reinforced concrete beam in 3rd embodiment. It is a perspective view which shows (G) and (H) of the construction process of a reinforced concrete column and a reinforced concrete beam in a third embodiment. (A) is the schematic diagram which looked at the beam reinforcing bar unit shown in Drawing 16 and Drawing 17 in the longitudinal direction, and (B) is the schematic diagram which looked at the beam reinforcing bar unit of other examples in the longitudinal direction.

<First embodiment>
The reinforcing bar fixing device and the reinforcing bar fixing device according to an embodiment of the present invention will be described with respect to a reinforcing bar structure in which the reinforcing bar fixing device and the reinforcing bar fixing device are applied to a joint portion (column beam joint) between a reinforced concrete column and a reinforced concrete beam. In each figure, the vertical direction is indicated by an arrow Z, and two directions perpendicular to the horizontal direction are indicated by an arrow X and an arrow Y. In each figure, only various reinforcing bars are shown, and concrete is not shown.

[Outline structure of the joint]
First, the schematic structure of the joint will be described.

  As shown in FIG. 1, a reinforcing bar fixing device 100 is embedded in a joint portion (column beam joint) 30 between a reinforced concrete column 10 and a reinforced concrete beam 20A, 20B, 20C, 20D on an above-ground floor or an underground floor. ing. Beam reinforcing bars 52L and 52U, which will be described later, and column main bars 14L and 14U are joined to the reinforcing bar fixing device 100. Further, the upper side of the joint portion 30 in the column 10 is an upper column 12U, and the lower side is a lower column 12L.

  The beams 20A and 20C are provided along the X direction, and the beams 20B and 20D are provided along the Y direction. The beams 20A, 20B, 20C, and 20D have the same configuration except that they are arranged in different locations and directions. Therefore, in the following description, when it is not necessary to distinguish these, A, B, C, and D after the reference numerals are omitted.

  In the present embodiment, the beam reinforcing bar embedded in the beam 20 includes a lower beam reinforcing bar unit 50L and an upper beam reinforcing bar unit 50U.

[Beam bar unit]
Next, the lower beam reinforcing bar unit 50L and the upper beam reinforcing bar unit 50U will be described.

  In the following description, each member constituting the lower beam reinforcing bar unit 50L is denoted by “L” after the symbol, and each member constituting the upper beam reinforcing bar unit 50U is denoted by “U” after the symbol. . The lower beam reinforcing bar unit 50L and the upper beam reinforcing bar unit 50U have substantially the same configuration except that the vertical direction is different. Therefore, U and L are omitted when explaining without distinguishing these.

  As shown in FIGS. 1, 2A, and 3, the lower beam reinforcing bar unit 50L includes a beam main reinforcing bar 52L and a shear reinforcing bar 54L. Similarly, the upper beam reinforcing bar unit 50U includes a beam main reinforcing bar 52U and a shear reinforcing bar 54U.

  The main beam reinforcing bar 52L constituting the lower beam reinforcing bar unit 50L is arranged in the beam length direction (X direction or Y direction, see FIG. 1) with a space in the beam width direction below the beam 20 (see FIGS. 1 and 3). It is arranged along. Further, the shear reinforcement bars 54L constituting the lower beam reinforcing bar unit 50L are U-shaped with the upper side as the opening side, and are arranged at intervals in the beam length direction, and the U-shaped bottom part is the beam main bar. It is joined to 52L.

  Similarly, the main beam reinforcing bar 52U constituting the upper beam reinforcing bar unit 50U has a beam length direction (X direction or Y direction, FIG. 1) spaced above the beam 20 (see FIGS. 1 and 3) in the beam width direction. Reference). Further, the shear reinforcing bar 54U constituting the upper beam reinforcing bar unit 50U has a U shape (inverted U shape) with the lower side as an opening side, and is disposed at intervals in the beam length direction. The bottom of the character is joined to the beam main bar 52U.

  As shown in FIGS. 1 and 3, the shaft end portion 55L of the shear reinforcement bar 54L of the lower beam reinforcing bar unit 50L and the shaft end portion 55U of the shear reinforcement bar 54U of the upper beam reinforcing bar unit 50U are overlapped. Are bound by.

  Further, as shown in FIGS. 2A and 3, a reinforcing bar cove 53 larger than the outer diameter of the beam main bar 52 is provided at the tip of each beam main bar 52.

  The beam main bar 52 and the shear reinforcement bar 54 are joined in advance by electric resistance welding (spot welding). Further, the beam reinforcing bar unit 50 of the present embodiment is manufactured not at the construction site but at a factory in another place.

[Rebar fixing device]
Next, the reinforcing bar fixing device 100 embedded in the joint portion (column beam joint portion) 30 will be described.

  As shown in FIGS. 4 and 5, the reinforcing bar fixing device 100 includes a lower frame member 110 </ b> L, an upper frame member 110 </ b> U, and a connecting member 130. In the following description, the lower member is basically denoted by L after the reference numeral, and the upper member is denoted by U after the reference numeral. Moreover, when it demonstrates without distinguishing both, L and U are abbreviate | omitted and demonstrated.

  The lower frame member 110L and the upper frame member 110U have a rectangular frame shape in plan view, and are arranged with an interval in the vertical direction. The lower frame member 110L and the upper frame member 110U are connected by a connecting member 130. The connecting member 130 is configured to include a column main bar 132 arranged in the joint portion 30 and a shear reinforcing bar 134 surrounding the column main bar 132. Note that the column main bars 132 and the shear reinforcement bars 134 are joined in advance by electric resistance welding (spot welding) or binding wires.

  Further, the lower end portion 135L of the column main bar 132 is welded and joined to the lower frame member 110L, and the upper end portion 135U of the column main bar 132 is welded to the upper frame member 110U. In the present embodiment, as shown in FIG. 6, the tip end portions 137 of the upper and lower end portions 135 in the columnar main bars 132 have a groove shape.

  As shown in FIG. 1, the shaft end 51L (see also FIG. 3) of the lower beam main bar 52L is joined to the lower frame member 110L, and the shaft end of the upper beam main bar 52U is joined to the upper frame member 110U. The part 51U (see also FIG. 3) is joined. Further, the end 16L of the column main reinforcement 14L of the lower pillar 12L is joined to the lower frame member 110L, and the end 16U of the column principal reinforcement 14U of the upper pillar 12U is joined to the upper frame member 110U.

  As shown in FIGS. 4 and 5, in the present embodiment, the lower frame member 110 </ b> L and the upper frame member 110 </ b> U are each a plurality of (two in this embodiment) plate frame members that are overlapped and joined together. 112L and 112U. Further, concave portions 116L and 116U are formed on the overlapping surfaces 114L and 114U of the plate frame members 112L and 112U.

  As shown in FIG. 4, the overlapping surfaces 114L and 114U of the plate frame members 112L and 112U are welded together. Further, the holes 118L and 118U are formed by bonding.

  As shown in FIG. 1, the overlapping surfaces 114L, with the shaft end portions 51L, 51U (see FIG. 3) of the beam main bars 52L, 52U engaged with the recesses 116L, 116U of the plate frame members 112L, 112U, respectively. 114U is joined.

  As shown by an imaginary line (two-dot broken line) in FIG. 5, in this embodiment, before the plate frame members 112U and 112L are joined to each other, one of the plate frame members 112L (the lower side) has the lower pillar 12L. The end portion 16L of the column main bar 14L is joined, and the end portion 16U of the column main bar 14U of the upper column 12U is joined to one (upper side) of the plate frame material 112U.

  Then, as shown in FIGS. 2B, 2C, and 5, before the plate frame members 112 are joined, the joint portion reinforcing bar unit 102 and the column reinforcing bar units 104L and 104L are combined. It is composed. In addition, the plate frame member 112 is joined to the column reinforcement unit 104 at the upper and lower ends. Further, a shear reinforcing bar 15 is joined to the column reinforcing bar unit 104 so as to surround the column main bar 14. Further, the column main bars 14 and the shear reinforcement bars 15 are joined in advance by electric resistance welding (spot welding) or binding wires.

  In addition, the column reinforcing bar unit 104 and the joint part reinforcing bar unit 102 of this embodiment are manufactured not in the construction site but in a factory in another place.

[Installation process of joint part]
Below, the construction process of the joint part 30 is demonstrated.

  As shown in FIG. 7 (A), a column rebar unit 104L constituting the lower column 12L (see also FIG. 1) is built, and the lower beam rebar unit is installed in the plate frame member 112L constituting the lower frame member 110L. Put 50L. At this time, the shaft end 51L (see FIG. 3) of the beam main reinforcing bar 52L of the beam reinforcing bar unit 50L is engaged with the recess 116L of the plate frame member 112L.

  As shown in FIG. 7 (B), the joint portion reinforcing bar unit 102 is placed so that the shaft end portion 51L of the beam main reinforcing bar 52L of the beam reinforcing bar unit 50L is engaged with the concave portion 116U of the plate frame member 112L. 114L (see FIG. 5) are joined together (see FIG. 4).

  As shown in FIG. 7C, the upper beam reinforcing bar unit 50U is placed on the plate frame member 112U constituting the upper frame member 110U. At this time, the shaft end 51U (see FIG. 3) of the beam main reinforcing bar 52U of the beam reinforcing bar unit 50U is engaged with the recess 116U of the plate frame member 112U.

  As shown in FIG. 7D, the column reinforcing bar unit 104U constituting the upper column 12U (see also FIG. 1) is inserted into the recess 116U of the plate frame member 112U and the shaft end 51U of the beam reinforcing bar 52U of the beam reinforcing bar unit 50U (see FIG. 7D). 3 (see FIG. 5), and the overlapping surfaces 114U (see FIG. 5) are joined (see FIG. 4).

  Then, a formwork is provided around the reinforced reinforcing bars, and concrete is placed to construct the reinforced concrete beam 20 and the column 10. Further, the shaft end portion 55L of the shear reinforcing bar 54L of the lower beam reinforcing bar unit 50L and the shaft end portion 55U of the shear reinforcing bar 54U of the upper beam reinforcing bar unit 50U are coupled by a lap joint. In addition, you may couple | bond by methods other than a lap joint. For example, welding may be performed before placing concrete.

  In addition, the column beam of an upper floor is constructed | assembled by repeating the construction demonstrated in FIG. 7 on the column reinforcement unit 104U.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

  The shaft end portion 51L of the beam main reinforcing bar 52L constituting the lower beam reinforcing bar unit 50L is joined (tightened) to the lower frame member 110L of the reinforcing bar fixing device 100, and the shaft of the beam main reinforcing bar 52U constituting the upper beam reinforcing bar unit 50U is joined. The end 51U is joined (tightened) to the upper frame member 110U of the reinforcing bar fixing device 100. Further, in this embodiment, the reinforcing bar 53 is larger than the hole diameter of the hole 118 (see FIG. 5) formed by overlapping the concave portion 116 (see FIG. 1), so that the beam is drawn from the lower frame member 110L and the upper frame member 110U. The main muscle 52 is not pulled out.

  The tensile loads of the beam main bars 52L and 52U are transmitted to the entire reinforcing bar fixing device 100 including the connecting member 130 (the column main bars 132 and the shear reinforcement bars 134) via the lower frame member 110L and the upper frame member 110U. The entire reinforcing bar fixing device 100 receives a tensile load. Further, the main beam 52 is joined (tightened) to the reinforcing bar fixing device 100, so that the deformation of the main beam 52 is restrained.

  Therefore, the beam main bar 52 is prevented from coming out from the joint portion 30. Therefore, in order to secure the fixing strength of the main beam of the joint 30, for example, it is not necessary to increase the bending amount of the main beam of the beam or to increase the fixing cost.

  Further, by engaging the shaft end portion 51 of the beam main bar 52 with the recess 116 of the plate frame member 112 and sandwiching and joining the plate frame member 112, the bar arrangement work of the beam main bar 52 is completed. Furthermore, as shown in FIG. 1, the beam main bars 52 of the beams 20A and 20C in the X direction and the beams 20B and 20C in the Y direction do not interfere with each other in the joint portion 30 (the beam main bars 52 do not interfere with each other). Further, the beam main bar 52 and the column main bar 14 do not interfere with each other. Therefore, the bar arrangement accuracy and workability are improved.

  Further, since it is not necessary to provide a step in the height direction so that the beam main bars 52 do not interfere with each other in the joint portion 30, the beam formation is made lower than when the beam main bars 52 are provided with a step in the height direction. be able to.

  In addition, as shown in FIG. 2, since the column reinforcing bar unit 104, the beam reinforcing bar unit 50, and the jointed reinforcing bar unit 102 are unitized, the quality is guaranteed as compared with the case where the bars are locally arranged. , Work on site is reduced.

  In the beam reinforcing bar unit 50, since the beam main reinforcing bar 52 and the shear reinforcing bar 54 are joined in advance by electric resistance welding, it is not necessary to bind the two at the site and there is no disturbance of the bar arrangement. Will improve. Furthermore, by dividing the beam reinforcement into the lower beam reinforcement unit 50L and the upper beam reinforcement unit 50U, compared with the case where it is not divided into two units, the load is not bulky when transporting to the site, Transportability is improved.

  Similarly, also in the beam reinforcing bar unit 50 and the column reinforcing bar unit 104, the column main bars 14, 132 and the shear reinforcing bars 15, 134 are joined in advance by electric resistance welding, so that it is necessary to bind them at the site. And there is no disturbance of the bar arrangement, so the workability is improved.

  In addition, it is possible to reinforce the columns, beams and walls before the construction of the slab formwork, improving the work efficiency of the rebar work.

[Modification]
Next, a modification of this embodiment will be described.

(First modification)
In the reinforcing bar fixing device 202 of the first modification shown in FIG. 8, the upper frame member 111U is composed of three plate frame members 113A, 113B, and 113C that are overlapped and joined to each other. Further, concave portions 116A, 116B, and 116C are formed on the overlapping surfaces 115A, 115B, and 115C of the plate frame members 113A, 113B, and 113C, respectively.

  Then, the shaft end 51U (see FIG. 3) of the upper beam main reinforcement 52U arranged in two stages in the vertical direction is engaged with the recesses 116A, 116B, and 116C of the plate frame members 113A, 113B, and 113C. In other words, the hole 118 into which the beam main reinforcing bar 52 is inserted and joined is formed in two stages up and down (see FIG. 8B). Therefore, in the reinforcing bar fixing device 202, the upper beam main reinforcing bar 52U corresponds to a double streak configuration.

  Similarly, the lower frame member may be composed of three plate frame members 113A, 113B, and 113C, and the lower beam main reinforcing bar 52L may correspond to a two-stage reinforcing member. Further, it may be composed of four or more plate frame members, and may correspond to a structure of three or more streaks.

(Second modification)
In the reinforcing bar fixing device 204 of the second modification shown in FIG. 9, the lower frame member 210L and the upper frame member 210U are not divided into plate frame members, and holes 118 are formed. Then, the beam main reinforcement 52 is inserted through the hole 118 and joined. Note that any method may be used for joining the beam main reinforcing bars 52 to the lower frame member 210L and the upper frame member 210U. For example, a weld metal may be poured into the hole 118 and solidified, or as shown in FIG. 9B, a fixing plate 190 may be joined to the tip 55 after insertion to prevent the metal from coming out.

(Third modification)
In the reinforcing bar fixing device 206 of the third modification shown in FIG. 10, the lower frame member 110L and the upper frame member 110U are connected by a connecting member 220 formed of a steel pipe. Note that the lower frame member 110L, the upper frame member 110U, and the connecting member 220 are joined by welding. By using the connecting member 220 as a steel pipe in this manner, the rigidity of the reinforcing bar fixing device 206 is improved, and as a result, the strength of the joint portion 30 is improved.

(Fourth modification)
In the reinforcing bar fixing device 208 of the fourth modification shown in FIG. 11, the plate frame material 112 is fastened by bolts 299 (and nuts). Therefore, for example, workability is improved as compared with welding joining.

(Fifth modification)
In the reinforcing bar fixing device 209 of the fifth modified example shown in FIG. 12, sleeves 212L and 212U are provided on the lower frame member 110L and the upper frame member 110U. Then, the shaft end portion 135 of the columnar main bar 132 is inserted into the sleeve 212, and the weld metal 214 (see FIG. 11B) is poured into the sleeve 212 to be consolidated. Providing the sleeve 212 in this way facilitates the positioning of the joining portion of the column main bars 132 and improves the positioning accuracy.

(Sixth modification)
In the reinforcing bar fixing device 211 of the sixth modification shown in FIG. 13, sleeves 212L and 212U are provided on the lower frame member 110L and the upper frame member 110U. Then, threaded grooves 137 and 213 (see FIG. 13B) are cut and screwed into the shaft end portion 135 of the columnar main bar 132 and the sleeve 212.

(Other)
In the fifth modification and the sixth modification, the number of sleeves 212 is larger than the number of column main bars 132. This is because versatility is enhanced so that it can be used even when the column main bars 132 are increased.

  Further, the joining of the column main reinforcement 14L of the lower column 12L and the column main reinforcement 14U of the upper column 12U with the lower frame member 110L and the upper frame member 110U is also performed as in the fifth and sixth modifications. It is possible to apply a structure that is inserted into and joined.

<Second embodiment>
The reinforcing bar fixing device 100 according to one embodiment of the present invention is applied to a foundation part which is a column beam joint (joint part) between a reinforced concrete foundation beam on a foundation floor and a reinforced concrete foundation column which is a steel frame from the upper part. The applied structure will be described.

  The reinforcing bar fixing device 100 has the same configuration as that of the first embodiment shown in FIGS. A modification of the first embodiment can also be applied to this embodiment. In addition, the same members as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

[Overview of basic section]
First, the outline of the basic part will be described.

  As shown in FIG. 14A, FIG. 14H, FIG. 15 and the like, the foundation part 200 is provided on the pile head 302. The base portion 200 is a column beam joint portion (joint portion) between the base beams 280A, 280B, and 280C and a reinforced concrete column 284 (FIG. 14H) that becomes a steel frame from the top.

  The reinforcing bar fixing device 100 similar to that of the first embodiment is embedded in the base portion 200, and the main beam beams 52L and 52U of the base beams 280A, 280B, and 280C are joined (tightened) to the reinforcing bar fixing device 100. .

  A steel frame 250 (see also FIG. 14G) is installed outside the reinforcing bar fixing device 100, and anchor bolts 254 for attaching the column steel frame 282 to the upper part of the reinforced concrete foundation column 284 are provided inside the reinforcing bar fixing device 100. Installed. Further, a basic reinforcing bar 312 and a basic reinforcing bar 310 are arranged around the reinforcing bar fixing device 100 (steel frame 250).

[Basic construction method]
Below, the construction method of a foundation part is demonstrated.

  As shown in FIG. 14 (A), a dumping container 304 for foundation construction is placed around the pile head 302 (see also FIG. 15). Then, a steel frame 250 (FIG. 14 (G)) used for fixing an anchor bolt 254 (see FIGS. 14 (G) and (H)) for attaching a column steel frame 282, which will be described later, to the discarding container 304 is configured. The side mount 251 is installed.

  As shown in FIG. 14B, the basic reinforcement 310 is performed, and the plate frame material 112L (see FIGS. 4 and 5) constituting the lower frame material 110L of the reinforcing bar fixing device 100 is installed on the mount 251. . In addition, the pile reinforcement 301 is arrange | positioned inside the board frame material 112L (refer also FIG. 15).

  As shown in FIG. 14C, the lower beam reinforcing bar unit 50L is placed on the plate frame member 112L. At this time, the shaft end portion 51L of the beam main reinforcing bar 52L on the lower side of the beam reinforcing bar unit 50L is engaged with the recess 116L of the plate frame member 112L constituting the lower frame member 110L.

  As shown in FIG. 14D, the joint portion reinforcing bar unit 102 is placed so that the shaft end portion 51L of the beam main reinforcing bar 52L of the beam reinforcing bar unit 50L is engaged with the recess 116U of the plate frame member 112L, and the overlapping surface 114L (see FIG. 5) are joined together (see FIG. 4).

  As shown in FIG. 14E, the upper beam reinforcing bar unit 50U is placed on the plate frame member 112U constituting the upper frame member 110U. At this time, the shaft end 51U (see FIG. 3) of the beam main reinforcing bar 52U of the beam reinforcing bar unit 50U is engaged with the recess 116U of the plate frame member 112U.

  As shown in FIG. 14 (F), the shaft end portion 51U (see FIG. 3) of the beam main reinforcing bar 52U of the beam reinforcing bar unit 50U is engaged with the recess 116U of the plate frame member 112U constituting the upper frame member 110U of the reinforcing bar fixing device 100. The overlapping surfaces 114U (see FIG. 5) are joined together (see FIG. 4).

  As shown in FIG. 14G, the upper frame 252 is installed using the lower frame 251 (see FIG. 14A), and the steel frame 250 is assembled. Then, anchor bolts 254 are attached to the steel frame 250. The steel frame 250 is installed outside the reinforcing bar fixing device 100, and the anchor bolt 254 is installed inside the reinforcing bar fixing device 100 (see also FIG. 15).

  As shown in FIG. 14 (H), the basic rebar 312 is arranged around the reinforcing bar fixing device 100 (steel frame 250).

  Then, a formwork is provided and concrete is placed, and the foundation portion 200, the reinforced concrete beam 280, and the reinforced concrete column 284 are constructed. In addition, after placing the concrete of the foundation part 200 that supports the column steel frame 282, the column steel frame 282 is attached to the anchor bolt 254.

  Further, the shaft end portion 55L of the shear reinforcing bar 54L of the lower beam reinforcing bar unit 50L and the shaft end portion 55U of the shear reinforcing bar 54U of the upper beam reinforcing bar unit 50U are coupled by a lap joint. In addition, you may couple | bond by methods other than a lap joint. For example, welding may be performed before placing concrete.

[Action and effect]
Next, functions and effects of the present embodiment will be described.

  As in the first embodiment, the shaft end 51L of the beam main reinforcing bar 52L constituting the lower beam reinforcing bar unit 50L is joined (tightened) to the lower frame member 110L of the reinforcing bar fixing device 100, and the upper beam reinforcing bar unit 50U. The shaft end portion 51U of the beam main reinforcing bar 52U is joined (tightened) to the upper frame member 110U of the reinforcing bar fixing device 100. Further, since the reinforcing bar cove 53 is larger than the hole diameter of the hole 118 (see FIG. 5) formed by overlapping the recess 116, the beam main reinforcing bar 52 is not pulled out from the lower frame member 110L and the upper frame member 110U.

  The tensile loads of the beam main bars 52L and 52U are transmitted to the entire reinforcing bar fixing device 100 including the connecting member 130 (the column main bars 132 and the shear reinforcement bars 134) via the lower frame member 110L and the upper frame member 110U. The entire reinforcing bar fixing device 100 receives a tensile load. Further, the main beam 52 is joined (tightened) to the reinforcing bar fixing device 100, so that the deformation of the main beam 52 is restrained.

  Accordingly, the beam main bar 52 is prevented from coming off from the base portion 200. Further, in order to secure the fixing strength of the beam reinforcement in the foundation portion 200, for example, it is not necessary to lengthen the fixing margin by increasing the bending of the beam reinforcement or the column formation.

  Further, in the base portion 200, the beam main bars 52 of the beams 280A and 280C in the X direction and the beam 280B in the Y direction do not interfere with each other (the beam main bars 52 do not interfere with each other). Further, since the reinforcing bar fixing device 100 is disposed so as to surround the anchor bolt 254 and the pile reinforcing bar 301, interference between these and the beam main reinforcing bar 52 is avoided.

  In addition, by using the lower frame 251 of the steel frame 250 that supports the anchor bolts 254 of the column steel frames 282 for mounting the reinforcing bar fixing device 100, the construction of the reinforcing bar fixing device 100 is made more efficient. Note that the reinforcing bar fixing device 100 may be attached by inserting a spacer block or the like under the lower frame member 110 without using the lower frame 251 of the steel frame 250.

  In addition, description of the effect | action and effect which overlap with 1st embodiment and a modification is abbreviate | omitted.

<Third embodiment>
A third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment and 2nd embodiment, and the overlapping description is abbreviate | omitted. However, in this embodiment, the fixing device (see FIG. 4 etc.) used in the first embodiment and the second embodiment is not used.

  In the reinforced concrete beam 20, a beam reinforcing bar 550 shown in FIG. 16 or a beam reinforcing bar 502 shown in FIG. 17 is embedded. As shown in FIGS. 16 and 18, the beam reinforcing bar 500 includes a lower beam reinforcing bar unit 550L and an upper beam reinforcing bar unit 550U. As shown in FIG. 17, the beam reinforcing bar 502 includes a lower beam reinforcing bar unit 552L and an upper beam reinforcing bar unit 552U.

[Beam bar unit]
Next, the lower beam reinforcing bar units 550L and 552L and the upper beam reinforcing bar units 550U and 552U will be described. In the following description, the members constituting the lower beam reinforcing bar units 550L and 552L are denoted by L after the reference numerals, and the members constituting the upper beam reinforcing bar units 550U and 552U are denoted by the reference numerals. U is added later. The lower beam reinforcing bar units 550L and 552L and the upper beam reinforcing bar units 550U and 552U have substantially the same configuration except that the vertical direction is different. Therefore, U and L are omitted when explaining without distinguishing these.

(Beam bar unit 550)
The beam reinforcing bar unit 550 shown in FIGS. 16 and 18 is not provided with a reinforcing bar cove 53 at the tip of the beam reinforcing bar 52 and the beam reinforcing bar 52 of the first and second embodiments (see FIGS. 2 and 3). Structure. Other structures and arrangements are the same. Therefore, detailed description is omitted.

(Beam bar unit 552)
As shown in FIG. 17, a vertical portion 554U that is bent downward and extends downward is formed at the end of the beam main reinforcing bar 52U of the upper beam reinforcing bar unit 552U. Similarly, a vertical portion 554L that is bent upward and extends upward is formed at the end of the beam main reinforcement 52L of the lower beam reinforcing bar unit 552L. Since the structure other than the vertical portion 554 is the same as that of the beam reinforcing bar unit 550 (FIGS. 16 and 18), detailed description thereof is omitted.

[Production method of beam rebar unit]
Next, an example of a method for manufacturing the beam reinforcing bar units 550 and 552 will be described.

  As shown in FIGS. 19A and 19C, the beam main bars 52 and the shear reinforcement bars 54 are arranged in a lattice shape in plan view. And the beam main reinforcement 52 and the shear reinforcement 54 are joined by electrical resistance welding (spot welding).

  Next, as shown in FIGS. 19B and 19D, the shear reinforcing bar 54 is bent into a U-shape with the beam main bars 52A arranged on both outer sides as fulcrums.

  The vertical portion 554 of the beam main reinforcing bar 52 of the beam reinforcing bar unit 552 may be formed in any manner. For example, the shear reinforcement bars 54 may be formed after being bent into a U shape, or may be formed in advance.

[Construction process and bar arrangement]
Next, the construction process will be described, and thereby the bar arrangement structure will also be described.

  As shown in FIG. 20 (A), the column main bars 14 constituting the nine reinforced concrete columns 10 are arranged and pressed. As shown in FIG. 20B, a shear reinforcing bar 15 is arranged around the column main bar 14 of each column 10, and the column main bar 14 and the shear reinforcing bar 15 are fixed by welding or binding wires.

  As shown in FIG. 20C, a column form 602 is built around the column main bar 14 and the shear reinforcement 15 of each column 10, and a beam form 604 is built as shown in FIG. Then, as shown in FIG. 20E, a slab form 606 is built.

  As shown in FIG. 20F, the lower beam reinforcing bar units 550L and 552L are arranged and dropped into the beam form frame 604 as shown in FIG.

  At this time, the beam reinforcing bar unit 550L (see FIGS. 16 and 18) is disposed across the pillars 10. Further, the two beam reinforcing bar units 550L straddling the central column 10 are arranged so as to overlap in a cross shape in plan view.

  Further, the beam reinforcing bar unit 552L (see FIG. 17) is arranged so that the vertical portion 554 of the beam reinforcing bar 52 is embedded in the joint portion with the column 10 in the outer peripheral portion.

  In FIG. 20, a gap is illustrated between the longitudinal ends of the beam reinforcing bar units 550L and 552L. However, this is for easy understanding of the arrangement of the beam reinforcing bar units 550L and 552L, and the ends are actually joined by pressure welding or mechanical joining. This also applies to the upper beam reinforcing bar units 550U and 552U described below.

  Then, as shown in FIG. 20 (G), after the lower beam reinforcing bar units 550L and 552L are dropped into the beam form frame 604, the upper beam reinforcing bar units 550U and 552U are arranged, and FIG. As shown, drop into beam formwork 604.

  At this time, similarly, the beam reinforcing bar unit 550U (see FIG. 16) is disposed across the pillars 10. Also, the two beam reinforcing bar units 550U straddling the central column 10 are arranged in a cross shape in plan view.

  Further, the beam reinforcing bar unit 552U (see FIG. 17) is arranged so that the vertical portion 554 of the beam reinforcing bar 52 is embedded in the joint portion with the column 10 in the outer peripheral portion.

  Then, formwork is provided and concrete is placed to construct the frame. Accordingly, as shown in FIGS. 16 and 17, the shaft end portion 55L of the shear reinforcement bar 54L of the lower beam reinforcing bar unit 550L, 552L and the shaft end portion of the shear reinforcement bar 54U of the upper beam reinforcing bar unit 550U, 552U. 55U is joined by a lap joint. Moreover, the longitudinal ends of the beam reinforcing bar units 550 and 552 are also joined by pressure welding or mechanical joining.

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  As shown in FIG. 20, the upper beam rebar units 550U and 552U can be dropped after dropping the lower beam rebar units 550L and 552L without considering interference between the beam rebars at the column beam contact portion. Therefore, the bar arrangement work becomes easy. Therefore, the construction efficiency of the reinforced concrete beam 20 is improved.

  Further, as shown in FIG. 19, the shear reinforcing bar 54 is bent into a U-shape with the beam main bars 52 arranged on both outer sides as fulcrums. Therefore, compared with the case where the shear reinforcement bar 54 is bent using a separate jig, the manufacturing efficiency of the beam reinforcing bar units 550 and 552 is improved, thereby improving the construction efficiency of the reinforced concrete beam 20.

  Then, by joining the U-shaped shear reinforcing bar 54 and the beam main bar 52 in advance to form the beam reinforcing bar units 550 and 552, it is not necessary to fix them with a binding wire or a wire, so that the workability and conveyance can be improved. Improves. Moreover, quality is stabilized by unitization, As a result, the man-hour at the time of construction is reduced.

  Further, in the beam reinforcing bar units 550 and 552, since the beam main reinforcing bar 52 and the shear reinforcing bar 54 are joined in advance by electric resistance welding, it is not necessary to bind the two at the site, and there is no disturbance of the bar arrangement. Workability is improved. Furthermore, by dividing the beam rebar into lower beam rebar units 550L and 552L and upper beam rebar units 550U and 552U, compared to the case where the rebar is not divided into two units, the cargo is loaded when transporting to the site. It is not bulky and improves the transportability.

<Others>
The present invention is not limited to the above embodiment.

  In the first embodiment and the second embodiment, the present invention is applied to the joint portion 30 and the base portion 200 on the ground floor, but the present invention is not limited to this. For example, the present invention can also be applied to a structure that does not support column steel in the foundation beam of the second embodiment (base beam joint) or a column beam joint between a foundation beam and a reinforced concrete column. The column steel frame supported by the anchor bolts of the foundation may be a steel tube column of concrete filled steel pipe (CFT) or a steel column of steel reinforced concrete.

  In the first embodiment and the second embodiment, the number of beams (beam main bars) joined to the reinforcing bar fixing device is four (first embodiment) or three (second embodiment), but is not limited thereto. Not. There may be two beams (the crossing direction or the same direction) may be joined to the reinforcing bar fixing device, or one beam.

  Moreover, also in the beam reinforcing bar unit 50 of the first embodiment and the second embodiment, as shown in FIG. 19, the beam main reinforcing bars arranged on both outer sides as in the beam reinforcing bar units 550 and 552 of the third embodiment. The shear reinforcing bar 54 may be bent into a U shape with 52 as a fulcrum.

  Further, as shown in FIG. 21A, when the beam reinforcing bar units 50, 550, and 552 are viewed in the longitudinal direction, the shear reinforcing bar 54 has the same length and is symmetrical, but FIG. As shown, it may be asymmetrical with different lengths.

  Furthermore, the present invention can be implemented in various modes without departing from the gist of the present invention.

10 columns 12L lower columns 12U upper columns 14L column main bars 14U column main bars 16L upper end 16U lower ends 50L beam reinforcing bar unit (lower beam reinforcing bar unit)
50U beam reinforcement unit (upper beam reinforcement unit)
51L Shaft end 52L Beam main bar (an example of lower beam main bar)
51L Shaft end 52U Beam main bar (an example of upper beam main bar)
DESCRIPTION OF SYMBOLS 100 Rebar fixing device 110L Lower frame material 110U Upper frame material 112L Board frame material 112U Plate frame material 116L Recess 116U Recess 130 Connection member 200 Base part 202 Rebar fixing device 204 Rebar fixing device 206 Rebar fixing device 220 Connection unit 208 Rebar fixing device 209 Reinforcing bar fixing device 211 Reinforcing bar fixing device 280A Foundation beam 280B Foundation beam 280C Foundation beam 282 Column steel 500 Beam reinforcement 550L Beam reinforcement unit (lower beam reinforcement unit)
550U Beam reinforcement unit (upper beam reinforcement unit)
552L Beam reinforcement unit (lower beam reinforcement unit)
552U Beam reinforcement unit (upper beam reinforcement unit)

Claims (5)

An upper beam reinforcing bar unit in which upper beam main bars arranged at intervals in the beam width direction and U-shaped shear reinforcing bars arranged at intervals in the beam length direction are joined and integrated;
An upper beam reinforcing bar unit in which a lower beam main bar arranged at intervals in the beam width direction and a U-shaped shear reinforcement bar arranged at intervals in the beam length direction are joined and integrated;
Have
A beam reinforcing bar constructed by arranging the upper beam reinforcing bar unit and the lower beam reinforcing bar unit across a column and combining the upper and lower shear reinforcing bars. A first step of arranging beam main bars and shear reinforcement bars in a lattice pattern, and welding and joining the beam main bars and the shear reinforcement bars;
A second step of bending the shear reinforcing bar into a U-shape with the outer beam main bar as a fulcrum;
A method for manufacturing a beam reinforcing bar unit. A lower beam reinforcing bar unit and an upper beam reinforcing bar unit manufactured by the manufacturing method according to claim 2,
A beam reinforcement constructed by arranging the upper beam reinforcement unit above the lower beam reinforcement unit and connecting the upper and lower shear reinforcement bars. A lower beam reinforcing bar unit in which a lower beam main reinforcing bar arranged at intervals in the beam width direction and a U-shaped shear reinforcing bar arranged at intervals in the beam length direction are joined and integrated;
An upper beam reinforcing bar unit in which upper beam main bars arranged at intervals in the beam width direction and U-shaped shear reinforcing bars arranged at intervals in the beam length direction are joined and integrated;
A lower frame member to which the shaft end portion of the lower beam main bar of the lower beam unit is bonded, an upper frame member to which the shaft end portion of the upper beam main bar of the upper beam bar unit is bonded, and the lower frame member And a connecting member that connects the upper frame member with an interval in the vertical direction, and a reinforcing bar fixing device,
Beam rebar joint structure comprising The lower frame member and the upper frame member of the reinforcing bar fixing device are each composed of a plurality of plate frame members that are overlapped and joined to each other, and on the overlapping surface, the shaft end portion of the lower beam main bar or the A recess is formed in which the shaft end of the upper beam main bar is engaged,
The joint structure of the beam reinforcing bar according to claim 4.

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